Estimates at the test plan level are often based on what is known about the project requirements. As the project develops, you can provide a more detailed estimate of the test execution effort by adding weight values to test cases. Test execution records inherit the weight of their associated test case. The weight is typically a numerical value for whatever unit of measurement the test team is accustomed to using. Some test teams might think of weight in terms of points, while others might think in terms of hours, minutes, or other measurements.